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50 lines
987 B
C
50 lines
987 B
C
/*
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ReactOS Sound System
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Timing helper
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Author:
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Andrew Greenwood (silverblade@reactos.org)
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History:
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31 May 2008 - Created
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Notes:
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Have checked timing in DebugView. A 10,000ms delay covered a period
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of 124.305 sec to 134.308 sec. Not 100% accurate but likely down to
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the delays in submitting the debug strings?
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*/
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/*
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Nanoseconds are fun! You must try some!
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1 ns = .000000001 seconds = .0000001 ms
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100 ns = .0000001 seconds = .00001 ms
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10000 ns = .00001 seconds = .001 ms
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1000000 ns = .001 seconds = 1 ms
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*/
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#include <ntddk.h>
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VOID
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SleepMs(ULONG Milliseconds)
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{
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LARGE_INTEGER Period;
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Period.QuadPart = Milliseconds;
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Period.QuadPart *= -10000;
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KeDelayExecutionThread(KernelMode, FALSE, &Period);
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}
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ULONG
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QuerySystemTimeMs()
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{
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LARGE_INTEGER Time;
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KeQuerySystemTime(&Time);
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Time.QuadPart /= 10000;
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return (ULONG) Time.QuadPart;
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}
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